jalapeno vs chili pepper

jalapeno and chili pepper both are nouns.

Word	Noun	Adjective	Verb	Adverb
jalapeno	Yes	No	No	No
chili pepper	Yes	No	No	No

As nouns, chili pepper is a hypernym of jalapeno; that is, chili pepper is a word with a broader meaning than jalapeno:

Other hypernyms of jalapeno include chile, chili, chilli, chilly.

As nouns, jalapeno and chili pepper are synonyms defined as:

jalapeno and chili pepper: plant bearing very hot and finely tapering long peppers; usually red

Other synonyms of jalapeno include Capsicum annuum longum, cayenne, cayenne pepper, chilli pepper, long pepper.

jalapeno (noun)	chili pepper (noun)
hot green or red pepper of southwestern United States and Mexico	very hot and finely tapering pepper of special pungency
plant bearing very hot and finely tapering long peppers; usually red	plant bearing very hot and finely tapering long peppers; usually red